Hypodermic syringe.



0. H. SHEPPARD.A

y HYPODEHMIC SYRINGE. APPLICATION HLED ocT.2x. 1914.

Patented Oct. 19, 1915.

L 'Unrrnn sfrafrns rarnnr ernten.

OSBORNE H. SHEPPARD, OF CHICAGO, ILLINOIS.

HYPODERMIC SYRINGE.

Application led ctober 21, 1914.

To all whom t may concern.'

Be it known that I, OsoRNn H. SHEP- rAnD, a citizen of the UnitedStates, and a resident of the city of Chicago, county of Cook, and Stateof Illinois, have invented certain new and useful Improvements inl-Iypodermic Syringes, of which the following is a specification.

My invention relates to improvements in hypodermic syringes, and has forits object the provision of an improved syringe of this character soconstructed and arranged as to prevent the pasage of sediment from thecharge in the syringe into the needle thereof.

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of partshereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawing forming a part of this specification, and in which,

Figure 1 is an elevationof a syringe embodying my invention, and Fig. 2,an enlarged detail section throughV the needle end thereof.

The preferred form of construction as illustrated in the drawingcomprises an ordi nary hypodermic syringe barrel 3 provided with theusual piston and operating means, as will be readily understood. Thissyringe is equipped with a perforated needle 4 adapted to be insertedunder the skin of the mounted in a detachable cap 5 vwhich is providedwith internal threads 6 adapted to engage a correspondingly threadednipple on the syringe barrel in position to receive the charge from thesyringe.V At its inner end 7, needle 4 is extended well into the openingin cap 5 and is provided with a spreading head or iiange 8, as shown inFig. 2. By

this arrangement, it will be observed, that when the charge is forcedout of the syringe barrel 3 through the hollow needle 4 a whirlpool willbe formed in the cap 5 around the inwardly projecting end 7y of needle4, said i lwhirlpool tending to throw any sediment in the chargeoutwardly against the sides of the cap down which said sediment willtravel l.

into the space 9 below the inner end of needle 4 which thus constitutesa sediment well Y 'Copies of this patent may ne obtained for ve centseach', by addressing the Commissioner of Patents,k

Specification of Letters Patent.

Needle 4 is Patented Oct. 19, 1915.

Serial No. 867,748.

for the collection of any sediment in the syringe charge. The outwardlyspreading head or flange 8 tends to prevent the passage of thissedilnentoutwardly through the needle, as will be readily understood. I find thatthis arrangement prevents thedischarge of sediment into the needle andthe consequent clogging and rusting thereof to such an extent that it isnot necessary to employ the usual cleaning wires with the needle. I havealso found that this arrangement tends to prevent the inclusion of airin the charge as it enters the patient which is an additional advantagefrom a medical point of view.

lfhile I have illustrated and described the preferred form ofconstruction for carrying my invention into effect, this is capable ofvariation and modification without departl ing from the spirit of theinvention. I, therefore, do not wish to be limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modifications as come within the scope of the appendedclaims.

Having described my invention what I claim as new and desire to secureby Letters Patent is:

l. The combination with a hypodermicl syringe, of a needle projectingwell into the f discharge end thereof and provided at its rounding itso'as to insure free circulation under said head, substantially asdescribed. In testimony whereof I have signed my name to thisspecification in the presence of l two subscribing witnesses.

OSBORNE H. SHEPPARD. Vitnesses: v

Josi-IUA R. H. Po'r'rs, JANET E. FARRELL.

Washington, D. C.

